Mr. SMITH had 4 daughters, each daughter had a brother…How many children does Mr. Smith have?
This can be an interesting riddle depending on how you perceive it!
The use of the word ‘had’ creates all the differences here
And the final question asks
“How many children does Mr. Smith have”
So these riddle questions need to be looked at carefully about language!
So the answer is 0
Perhaps all the children are no longer alive now!